Winding Core Outer Diameter Control for Adhesive Tape Deviation
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Solution Overview
Problem
The existing dicing/die-bonding tapes exhibit transfer marks and winding deviations due to steps formed during lamination and winding on a cylindrical core, which can degrade semiconductor device reliability and require reduced winding tension, leading to further issues.
Innovation Solution
A cylindrical winding core with an outer diameter that maintains a deviation amount of the adhesive layer between inner and outer tape portions at 55 mm or less, preventing transfer marks and winding deviations by optimizing the tension distribution and layer alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the winding tension is decreased to suppress transfer marks, then the transfer marks are suppressed, but winding deviation occurs when the roll is stored and carried in an upright state
Solution Approach 1:
The patent changes the parameter of winding tension distribution by optimizing the outer diameter of the winding core. By setting the outer diameter to a specific range (100 mm to 150 mm), the tension distribution during winding is optimized, allowing sufficient winding tension to prevent transfer marks while maintaining winding stability and preventing deviation during storage and transport.
2Manufacturing precision
If the outer diameter of the winding core is increased to reduce tension concentration, then transfer marks are suppressed, but the deviation amount of the adhesive layer increases
Solution Approach 1:
The patent optimizes the outer diameter parameter of the winding core to a specific range (100 mm to 150 mm). This parameter optimization balances two opposing requirements: it is large enough to distribute tension and suppress transfer marks, but not so large as to cause excessive deviation of the adhesive layer between inner and outer tape portions.
Data Source
AI summary
Provided is a winding core which has a cylindrical shape and on which an adhesive tape, formed by an adhesive layer formed on an elongated base film in the longitudinal direction of the base film, is wound as multiple layers, wherein the outer diameter of the winding core is a dimension in which a deviation amount of the adhesive layer in the circumferential direction of the winding core between adjacent inner and outer tape portions of the adhesive tape in the radial direction of the winding core becomes 55 mm or less when the adhesive tape is wound on the winding core.